[Haskell-beginners] Installing packages in Ubuntu

[Glurk]

Hi,

I'm a beginner to both Cabal and Linux.
I'm a bit confused as to whether I need to be using Cabal when installng 
packages.

I'm running Ubuntu 9.10, and from the Synaptic Package Manager, I can select 
various Haskell packages to install - will this install the package correctly, 
or is there something I need to do in Cabal as well ?

Thanks ! :)